From: Vladimir V <vv.os.swe@gmail.com>
To: Jonathan Wakely <jwakely@redhat.com>
Cc: libstdc++@gcc.gnu.org, gcc-patches@gcc.gnu.org
Subject: Re: Problem building libstdc++ for the avr target
Date: Thu, 10 Dec 2020 00:00:12 +0100 [thread overview]
Message-ID: <CA+=iAipLUkVs78obkK+sCFhHXrO1NV2RqO0yEs1FKv46fmfWDA@mail.gmail.com> (raw)
In-Reply-To: <20201209170125.GW2309743@redhat.com>
Thank you for the quick response.
The patch solves the problem.
ср, 9 дек. 2020 г. в 18:01, Jonathan Wakely <jwakely@redhat.com>:
> On 09/12/20 12:49 +0000, Jonathan Wakely wrote:
> >On 09/12/20 13:32 +0100, Vladimir V wrote:
> >>Hello.
> >>
> >>While testing with the current upstream I encountered a compilation
> issue.
> >>Although I build with "--disable-threads" flag the following error
> occurs:
> >>
> >>../../../../../libstdc++-v3/src/c++11/thread.cc:39:4: error: #error "No
> >>sleep function known for this target"
> >>
> >>Previously the check was inside the #ifdef _GLIBCXX_HAS_GTHREADS that
> >>prevented the error from happening (in my case with gcc v10.1),
> >>So I would like to ask if the thread.cc should be involved in the build
> if
> >>the threads support is configured to be disabled?
> >
> >Yes, the file is always built, but which definitions it contains
> >depends on what is configured for the target.
> >
> >The std::this_thread::sleep_for and std::this_thread::sleep_until
> >functions don't actually depend on threads at all. They just sleep.
> >
> >But that still requires target support, just different support from
> >threads.
> >
> >>And if it should, then can the condition be reworked to cover the
> described
> >>case?
> >
> >Yes, I'll do that. Thanks for bringing it to my attention.
> >
> >I assume we can't use avr-libc's delay functions, because they depend
> >on the CPU clock frequency, which isn't known when we compile
> >libstdc++. So I'll just suppress the declarations of those functions
> >and remove the #error.
>
> The attached patch adds a new _GLIBCXX_NO_SLEEP configure macro which
> should get defined for your hosted AVR build. That should mean that
> std::this_thread::sleep_for is not defined, and src/c++11/thread.cc
> will no longer insist on some way to sleep being supported.
>
> I've only tested this on powerpc64le-linux, so please let me know if
> it works for you.
>
> Pushed to master.
>
>
>
next prev parent reply other threads:[~2020-12-09 23:00 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-07 17:32 Vladimir V
2020-12-07 20:30 ` Jonathan Wakely
2020-12-07 20:32 ` Jonathan Wakely
2020-12-09 0:28 ` Vladimir V
2020-12-09 12:32 ` Vladimir V
2020-12-09 12:49 ` Jonathan Wakely
2020-12-09 17:01 ` Jonathan Wakely
2020-12-09 23:00 ` Vladimir V [this message]
2020-12-10 17:39 ` Vladimir V
2020-12-10 20:15 ` Jonathan Wakely
2020-12-10 20:31 ` Vladimir V
2020-12-15 11:48 ` Jonathan Wakely
2020-12-16 7:33 ` Vladimir V
2020-12-07 20:41 ` Keith Packard
2020-12-07 21:06 ` Jonathan Wakely
2021-01-04 11:28 ` Vladimir V
2021-01-08 18:21 ` Jonathan Wakely
2021-01-22 14:46 ` Vladimir V
2021-02-07 13:55 ` Vladimir V
2021-02-07 18:22 ` Vladimir V
2021-02-07 18:23 ` Keith Packard
2021-02-07 22:33 ` Vladimir V
2021-02-07 23:06 ` Keith Packard
2021-02-08 12:58 ` Vladimir V
2021-02-08 17:38 ` Jonathan Wakely
2021-02-08 17:45 ` Jonathan Wakely
2021-02-08 17:47 ` Jonathan Wakely
2021-02-08 22:25 ` Vladimir V
2021-02-09 10:47 ` Jonathan Wakely
2021-02-09 10:54 ` Vladimir V
2021-03-25 9:27 ` Vladimir V
2021-03-25 12:36 ` Jonathan Wakely
2021-03-25 18:27 ` Jonathan Wakely
2021-03-25 21:37 ` Vladimir V
2021-03-25 23:02 ` Jonathan Wakely
2021-03-26 8:25 ` Vladimir V
2020-12-07 21:51 ` Vladimir V
2020-12-07 23:00 ` Keith Packard
2020-12-08 8:12 ` Vladimir V
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